Category: R
-
Root fracture
A fracture, split, or breaks in the otherwise solid part of a tooth that is typically covered by cementum and is found in the more apical portion (root of the tooth).
-
Root‐form endosteal dental implant
An implant used in dental applications that is placed into the bone and has some degree of similarity to a natural root.
-
Root concrescence
The fusion of roots of adjacent teeth.
-
Root canal
The space within the root of a tooth containing connective tissue, nerves, and blood vessels, and connecting the pulp chamber with the apex of the root. A canal in the root of a tooth through which the nerves and blood vessels pass. The part of the tooth that extends from the pulp chamber to the…
-
Root
The part of a tooth that is typically covered by cementum and is found in the more apical portion. Attached to it is usually a periodontal ligament that allows for connection to the adjacent bone. The lower part of the axis of a angiosperm. It is usually branching and does not bear buds or leaves.…
-
Roentgen ray
Radiation emitted from a tube that results from striking an anode with electrons emitted from a heated cathode. Radiation resulting from the excitation of the innermost orbital electron within an atom. An X-ray or gamma ray which can pass through tissue and leave an image on a photographic film.
-
Rochette bridge
(Alain L. Rochette, French physician and dentist): a resin‐bonded fixed dental prosthesis incorporating holes within the metal framework and lutes to the lingual aspect of teeth adjacent to an edentulous space that replaces one or more teeth.
-
RNA (abbrev)
Ribonucleic acid.
-
Risk indicator
A probable risk factor that has not been confirmed by longitudinal studies.
-
Risk factor
Environmental, behavioral, or biologic factor that increases the likelihood of developing disease; identified through longitudinal studies and confirmed to be present before the onset of disease, i.e., smoking, diabetes, pathogenic bacteria. A habit, trait, condition, or genetic alteration that increases a person’s chance of developing a disease. A circumstance or condition that increases one’s chances…